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Note 14 - Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capital expenditures | $ 174,786 | $ 204,604 | $ 165,911
Change in Accrued Property Additions | 244 | 3,033 | (4,367)
Cash-Based Capital Expenditures | 175,030 | 207,637 | 161,544
Las Vegas Locals [Member] |  |  |
Capital expenditures | 23,936 | 26,207 | 33,503
Downtown Las Vegas [Member] |  |  |
Capital expenditures | 15,150 | 8,881 | 12,885
Midwest and South [Member] |  |  |
Capital expenditures | 68,933 | 80,883 | 69,285
Total Reportable Segment [Member] |  |  |
Capital expenditures | 108,019 | 115,971 | 115,673
Corporate Segment [Member] |  |  |
Capital expenditures | $ 66,767 | $ 88,633 | $ 50,238

X
- Definition The amount of capital expenditures. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash based capital expenditures. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in accrued property additions. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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X
- Details
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Balance Type: |
Period Type: |

X
- Details
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X
- Details
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X
- Details
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